Jimoto no Ijimekko-tachi ni Shikaeshi Shiyou to Shitara, Betsu no Tatakai ga Hajimatta.

Synopsis:

As a child, Kotaro was constantly picked on by three local prodigies: Akari, an exceptional wrestler; Kanae, a gifted basketball star; and Shigure, a gaming genius. Determined to prove himself, he challenged each of them in their own arenas time and again—but never managed to win. Now a high school senior, Kotaro gets a second chance to face his former rivals and settle the score. However, what awaits him is a shocking truth he never saw coming…